It's not that an $11 bowl of official San Francisco clam chowder doesn't hit the spot. And, granted, there's no substitute for an authentic Machu Picchu souvenir visor. But not all overcrowded ...

If you’re a frequent traveler, then you may one day run into an offer for a souvenir passport stamp. Antarctica offers a stamp at some of its scientific stations, Machu Picchu offers a stamp at ...